GLENDALE, Ariz. (USA TODAY) - Justin Bieber had a mission with his new Believe tour, which kicked off Saturday at 18,000-seat Jobing Arena in this Phoenix suburb. It was to show that the 18-year-old was ready to eclipse the tween YouTube phenomenon and prove he was an entertainer of merit and endurance.

He indeed showed he was a man at the sold-out venue, but it had nothing to do with his new array of urban-tinged tunes or a stage spectacle that melded the visual gee-whiz of Hollywood with the crowd-pleasing power of Broadway. And it had everything to do with throwing up. In an impressive embodiment of show-must-go-on bravura, Bieber succumbed to an upset stomach not once but twice during his 21-song set, leaving fans wide-eyed and concerned, only to then charge back on stage.

This isn't even news. Plenty of performers have vomited onstage. No big deal.But of course it's Justin Bieber so people automatically feel the need to tell the same old shitty jokes from three years ago.